The British Royal Navy's HMS Echo entered the Black Sea on Sunday, according to the portal Bosphorus Observer, which monitors vessels that go through the Bosphorus.
According to the British authorities, the ship has been deployed to the region in order to participate in a freedom of navigation manoeuvre.
The vessel, equipped with two Oerlikon 20 mm cannons and tree miniguns, can provide almost real-time tailored environmental information.
Earlier in April, NATO countries conducted military drills in the Black Sea. After the Russian fleet carried out its own training in response, Russian Deputy Foreign Minister Alexander Grushko warned that increased NATO activities in the area heightens risks to security in the region.